Improvement in paper for bonds, drafts, checks



ROBERT PRICE, OF NEW YORK, N. Y.

Letters Patent No. 105,125, dated July 5, 1870.

IMPROVEMENT IN PAPER FOR BONDS, DRAPTS, CHECKS, 8w.

The Schedule referred to in these Letters Patent and making part of the same To all whom it may concern Be 'it known that I, ROBERT PRICE, of the city, county, and State of New York, have invented a new and improved Process for Treating Paper; and I do herebymleclare the following to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same.

This invention relates to a process for treating paper, which is carriedout asfollows:

I first take the paper, out it in sheets of suitable size, and float each sheet on a bath or solution of from twenty to forty grains of nitrate of silver to one ounce of water, for from ten to thirty seconds, according to the strength of the bath; their hang it up to dry in the dark. -When dry, expose it to the light, whereby the color of the paper changes from white to gray, the depth of the shade being dependent upon the time of the exposure.

When the paper has assumed the desired shade, I soak the same in water for few minutes, then take it out and place it in a bath or solution composed of one quart of water to two ounces of hyposulphite of soda, leaving the paper remain in this solution for from ten to fifteen minutes. Then wash in clean water and hang up to dry.

By these means a paper is obtained of a uniform gray color; but if it is desired to give to the paper a variegated surface, I float the sheets on a bath of nitrate of silver, as above, and after having dried them in the dark, I cover them up with an open-work fabric, such as lace o'r tulle, or any perforated material, and expose them to the light, as above stated.

By the open-work fabric the light -is stopped ofi' from portions -of the paper, and such portions remain white, while the exposed portions turn gray.

Vhen the paper has assumed the desired shade, I

soak it in water, and afterwards in a solution of hyposulphite of soda, as above described.

By these means a paper is obtained which can be used with great advantagefMLrevenue or postagestamps, or for bank-checks, bonds,'or other documents of value, the design of the stamps,'or the words requiredto designate a check or bond being produced either by printing with ordinary printers ink, or, in

the case of a check, partially by'printing and partially by writing with any suitable writing-fluid; and if an attempt is made-to alter any part'or parts of the printed or written characters, thesurface of the paper becomes discolored, and the stamp, check, or bond is spoiled and unfit for use.

My'paper can belnsed in. allcases where it is desirable to have a surface. to receive words, figures, or other characters printed or written with ordinary ink,- and forming a perfect safeguard against any change detection.

What I claim as new, and desire to secure by Letters Patent, is' I 1. The within-described process of treating paper.

2. Printing-paper.- treated as herein described, for

the purposes specified.

" ROBERT PRICE.

in such printed or written matterwithout immediate Witnesses:

W. HAUFF, E. F. KAs'rENnUBnRi 

